Which among the following substances does not conduct electricity in its aqueous solution state? (a) glucose (b) alcohol (c) hydrochloric acid (d) common salt

In order to conduct electricity, a substance must have charged particles or ions that are free to move and carry the electric charge. In an aqueous solution, substances that dissolve into ions are considered electrolytes and can conduct electricity. Substances that do not ionize in water are known as non-electrolytes and do not conduct electricity.

We will now evaluate each of the given substances based on their ability to ionize or produce charged particles in their aqueous solution state. (a) Glucose: Glucose is a simple sugar that dissolves in water, but it does not ionize or produce charged particles. As a result, an aqueous solution of glucose does not conduct electricity. (b) Alcohol: Alcohol does not ionize or produce charged particles when dissolved in water. Thus, an aqueous solution of alcohol does not conduct electricity. (c) Hydrochloric acid: Hydrochloric acid (HCl) is a strong acid that ionizes completely in water. When dissolved in water, HCl produces hydrogen ions (H+) and chloride ions (Cl-). These ions can carry the electric charge, making an aqueous solution of hydrochloric acid an excellent conductor of electricity. (d) Common salt: Common salt, or sodium chloride (NaCl), is an ionic compound that dissociates into sodium ions (Na+) and chloride ions (Cl-) when dissolved in water. These ions can move and carry the electric charge, allowing an aqueous solution of common salt to conduct electricity.

Based on our evaluation in Step 2, we can see that: - Glucose (a) in its aqueous solution does not conduct electricity. - Alcohol (b) in its aqueous solution does not conduct electricity. - Hydrochloric acid (c) in its aqueous solution is a good conductor of electricity. - Common salt (d) in its aqueous solution is a good conductor of electricity. Therefore, among the given substances, both glucose (a) and alcohol (b) do not conduct electricity in their aqueous solution state.